Ruby win32api , GetPixel 如何调用？
Gdi32.dll
http://msdn.microsoft.com/en-us/library/windows/desktop/dd144909
COLORREF GetPixel(
_In_ HDC hdc,
_In_ int nXPos,
_In_ int nYPos
);
Public Declare Function GetPixel Lib "gdi32" (ByVal hdc As Long, ByVal x As Long, ByVal y As Long) As Long
这个 api ,如何用 Ruby::Fiddle 调用？ 或有其他好办法吗？
一般 ruby2.0 里面是建议 Ruby::Fiddle 的吧 ?
$a = DL.dlopen('gdi32')
def GetPixel hwnd,x,y
getp = $a['GetPixel' ]
getp.call(hwnd,x,y)
end
def SetPixel hwnd,x,y
setp = $a['SetPixel' ]
setp.call(hwnd,x,y)
end
p GetPixel 0,1,1
exit
err: NoMethodError: undefined method `call' for 1997915093:Fixnum
